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session.go
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session.go
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// Copyright 2013 Beego Authors
// Copyright 2014 Unknwon
//
// Licensed under the Apache License, Version 2.0 (the "License"): you may
// not use this file except in compliance with the License. You may obtain
// a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations
// under the License.
// Package session a middleware that provides the session manager of Macaron.
package session
// NOTE: last sync fc6b9ce on Nov 4, 2014.
import (
"crypto/rand"
"encoding/hex"
"fmt"
"net/http"
"net/url"
"time"
// "github.com/Unknwon/macaron"
)
func Version() string {
return "0.0.5"
}
type RawStore interface {
Set(key, value interface{}) error //set session value
Get(key interface{}) interface{} //get session value
Delete(key interface{}) error //delete session value
SessionID() string //back current sessionID
SessionRelease(w http.ResponseWriter) // release the resource & save data to provider & return the data
Flush() error //delete all data
}
// Store contains all data for one session process with specific id.
type Store interface {
RawStore
GetActiveSession() int
}
type Options struct {
// Name of provider. Default is memory.
Provider string
// Provider configuration string.
Config
}
func prepareOptions(options []Options) Options {
var opt Options
if len(options) > 0 {
opt = options[0]
}
// Defaults
if len(opt.Provider) == 0 {
opt.Provider = "memory"
}
opt.EnableSetCookie = true
if len(opt.CookieName) == 0 {
opt.CookieName = "EchoSession"
}
if len(opt.CookiePath) == 0 {
opt.CookiePath = "/"
}
if opt.Gclifetime == 0 {
opt.Gclifetime = 3600
}
if opt.Maxlifetime == 0 {
opt.Maxlifetime = opt.Gclifetime
}
if opt.SessionIdLength == 0 {
opt.SessionIdLength = 16
}
return opt
}
// // ___________.____ _____ _________ ___ ___
// // \_ _____/| | / _ \ / _____// | \
// // | __) | | / /_\ \ \_____ \/ ~ \
// // | \ | |___/ | \/ \ Y /
// // \___ / |_______ \____|__ /_______ /\___|_ /
// // \/ \/ \/ \/ \/
// type Flash struct {
// ctx *macaron.Context
// url.Values
// ErrorMsg, WarningMsg, InfoMsg, SuccessMsg string
// }
// func (f *Flash) set(name, msg string, current ...bool) {
// isShow := false
// if (len(current) == 0 && macaron.FlashNow) ||
// (len(current) > 0 && current[0]) {
// isShow = true
// }
// if isShow {
// f.ctx.Data["Flash"] = f
// } else {
// f.Set(name, msg)
// }
// }
// func (f *Flash) Error(msg string, current ...bool) {
// f.ErrorMsg = msg
// f.set("error", msg, current...)
// }
// func (f *Flash) Warning(msg string, current ...bool) {
// f.WarningMsg = msg
// f.set("warning", msg, current...)
// }
// func (f *Flash) Info(msg string, current ...bool) {
// f.InfoMsg = msg
// f.set("info", msg, current...)
// }
// func (f *Flash) Success(msg string, current ...bool) {
// f.SuccessMsg = msg
// f.set("success", msg, current...)
// }
type store struct {
RawStore
*Manager
}
// // Sessioner is a middleware that maps a session.SessionStore service into the Macaron handler chain.
// // An single variadic session.Options struct can be optionally provided to configure.
// func Sessioner(options ...Options) macaron.Handler {
// opt := prepareOptions(options)
// manager, err := NewManager(opt.Provider, &opt.Config)
// if err != nil {
// panic(err)
// }
// go manager.GC()
// return func(ctx *macaron.Context) {
// // FIXME: should I panic for error?
// sess, _ := manager.SessionStart(ctx.Resp, ctx.Req.Request)
// // Get flash.
// vals, _ := url.ParseQuery(ctx.GetCookie("macaron_flash"))
// if len(vals) > 0 {
// f := &Flash{Values: vals}
// f.ErrorMsg = f.Get("error")
// f.SuccessMsg = f.Get("success")
// f.InfoMsg = f.Get("info")
// f.WarningMsg = f.Get("warning")
// ctx.Data["Flash"] = f
// ctx.SetCookie("macaron_flash", "", -1, opt.CookiePath)
// }
// f := &Flash{ctx, url.Values{}, "", "", "", ""}
// ctx.Resp.Before(func(macaron.ResponseWriter) {
// sess.SessionRelease(ctx.Resp)
// if flash := f.Encode(); len(flash) > 0 {
// ctx.SetCookie("macaron_flash", flash, 0, opt.CookiePath)
// }
// })
// ctx.Map(f)
// s := store{
// RawStore: sess,
// Manager: manager,
// }
// ctx.MapTo(s, (*Store)(nil))
// }
// }
// Provider contains global session methods and saved SessionStores.
// it can operate a SessionStore by its id.
type Provider interface {
SessionInit(gclifetime int64, config string) error
SessionRead(sid string) (RawStore, error)
SessionExist(sid string) bool
SessionRegenerate(oldsid, sid string) (RawStore, error)
SessionDestroy(sid string) error
SessionAll() int //get all active session
SessionGC()
}
var provides = make(map[string]Provider)
// Register makes a session provide available by the provided name.
// If Register is called twice with the same name or if driver is nil,
// it panics.
func Register(name string, provide Provider) {
if provide == nil {
panic("session: Register provide is nil")
}
if _, dup := provides[name]; dup {
panic("session: Register called twice for provider " + name)
}
provides[name] = provide
}
type Config struct {
CookieName string `json:"cookieName"`
CookiePath string `json:"cookiePath"`
EnableSetCookie bool `json:"enableSetCookie,omitempty"`
Gclifetime int64 `json:"gclifetime"`
Maxlifetime int64 `json:"maxLifetime"`
Secure bool `json:"secure"`
CookieLifeTime int `json:"cookieLifeTime"`
ProviderConfig string `json:"providerConfig"`
Domain string `json:"domain"`
SessionIdLength int64 `json:"sessionIdLength"`
}
// Manager contains Provider and its configuration.
type Manager struct {
provider Provider
config *Config
}
// Create new Manager with provider name and json config string.
// provider name:
// 1. cookie
// 2. file
// 3. memory
// 4. redis
// 5. mysql
// json config:
// 1. is https default false
// 2. hashfunc default sha1
// 3. hashkey default beegosessionkey
// 4. maxage default is none
func NewManager(provideName string, config *Config) (*Manager, error) {
provider, ok := provides[provideName]
if !ok {
return nil, fmt.Errorf("session: unknown provide %q (forgotten import?)", provideName)
}
config.EnableSetCookie = true
if config.Maxlifetime == 0 {
config.Maxlifetime = config.Gclifetime
}
if err := provider.SessionInit(config.Maxlifetime, config.ProviderConfig); err != nil {
return nil, err
}
return &Manager{
provider: provider,
config: config,
}, nil
}
// Start session. generate or read the session id from http request.
// if session id exists, return SessionStore with this id.
func (manager *Manager) SessionStart(w http.ResponseWriter, r *http.Request) (session RawStore, _ error) {
cookie, err := r.Cookie(manager.config.CookieName)
if err != nil || len(cookie.Value) == 0 {
sid, err := manager.sessionId(r)
if err != nil {
return nil, err
}
session, err = manager.provider.SessionRead(sid)
if err != nil {
return nil, err
}
cookie = &http.Cookie{Name: manager.config.CookieName,
Value: url.QueryEscape(sid),
Path: manager.config.CookiePath,
HttpOnly: true,
Secure: manager.config.Secure,
Domain: manager.config.Domain,
}
if manager.config.CookieLifeTime >= 0 {
cookie.MaxAge = manager.config.CookieLifeTime
}
if manager.config.EnableSetCookie {
http.SetCookie(w, cookie)
}
r.AddCookie(cookie)
} else {
sid, err := url.QueryUnescape(cookie.Value)
if err != nil {
return nil, err
}
if manager.provider.SessionExist(sid) {
session, err = manager.provider.SessionRead(sid)
if err != nil {
return nil, err
}
} else {
sid, err = manager.sessionId(r)
if err != nil {
return nil, err
}
session, err = manager.provider.SessionRead(sid)
if err != nil {
return nil, err
}
cookie = &http.Cookie{Name: manager.config.CookieName,
Value: url.QueryEscape(sid),
Path: manager.config.CookiePath,
HttpOnly: true,
Secure: manager.config.Secure,
Domain: manager.config.Domain,
}
if manager.config.CookieLifeTime >= 0 {
cookie.MaxAge = manager.config.CookieLifeTime
}
if manager.config.EnableSetCookie {
http.SetCookie(w, cookie)
}
r.AddCookie(cookie)
}
}
return session, nil
}
// Destroy session by its id in http request cookie.
func (manager *Manager) SessionDestroy(w http.ResponseWriter, r *http.Request) {
cookie, err := r.Cookie(manager.config.CookieName)
if err != nil || cookie.Value == "" {
return
} else {
manager.provider.SessionDestroy(cookie.Value)
expiration := time.Now()
cookie := http.Cookie{Name: manager.config.CookieName,
Path: manager.config.CookiePath,
HttpOnly: true,
Expires: expiration,
MaxAge: -1}
http.SetCookie(w, &cookie)
}
}
// Get SessionStore by its id.
func (manager *Manager) GetSessionStore(sid string) (sessions RawStore, err error) {
sessions, err = manager.provider.SessionRead(sid)
return
}
// Start session gc process.
// it can do gc in times after gc lifetime.
func (manager *Manager) GC() {
manager.provider.SessionGC()
time.AfterFunc(time.Duration(manager.config.Gclifetime)*time.Second, func() { manager.GC() })
}
// Regenerate a session id for this SessionStore who's id is saving in http request.
func (manager *Manager) SessionRegenerateId(w http.ResponseWriter, r *http.Request) (session RawStore) {
sid, err := manager.sessionId(r)
if err != nil {
return nil
}
cookie, err := r.Cookie(manager.config.CookieName)
if err != nil && cookie.Value == "" {
// delete old cookie
session, err = manager.provider.SessionRead(sid)
if err != nil {
return nil
}
cookie = &http.Cookie{Name: manager.config.CookieName,
Value: url.QueryEscape(sid),
Path: manager.config.CookiePath,
HttpOnly: true,
Secure: manager.config.Secure,
Domain: manager.config.Domain,
}
} else {
oldsid, err := url.QueryUnescape(cookie.Value)
if err != nil {
return nil
}
session, err = manager.provider.SessionRegenerate(oldsid, sid)
if err != nil {
return nil
}
cookie.Value = url.QueryEscape(sid)
cookie.HttpOnly = true
cookie.Path = "/"
}
if manager.config.CookieLifeTime >= 0 {
cookie.MaxAge = manager.config.CookieLifeTime
}
http.SetCookie(w, cookie)
r.AddCookie(cookie)
return session
}
// Get all active sessions count number.
func (manager *Manager) GetActiveSession() int {
return manager.provider.SessionAll()
}
// Set cookie with https.
func (manager *Manager) SetSecure(secure bool) {
manager.config.Secure = secure
}
// generate session id with rand string, unix nano time, remote addr by hash function.
func (manager *Manager) sessionId(r *http.Request) (string, error) {
b := make([]byte, manager.config.SessionIdLength)
n, err := rand.Read(b)
if n != len(b) || err != nil {
return "", fmt.Errorf("fail to read from the system CSPRNG.")
}
return hex.EncodeToString(b), nil
}